1 Water Supply Conditions Update
Steven R. Ritchie
Assistant General Manager, Water
August 31, 2026
August 31, 2026, Reservoir Storage
2 Reservoir
Current
Storage1,2,3
Maximum
Storage4
Available
Capacity
Percent of
Maximum
Storage
Normal
Percent of
Maximum
Storage5
(AF) (AF) (AF)
Tuolumne System
Hetch Hetchy 311,900 360,360 48,460 86.6% 87.7%
Cherry 240,000 273,345 33,345 87.8% -
Eleanor 20,910 27,100 6,190 77.2% -
Water Bank 570,000 570,000 0 100.0% 100.0%
Total Tuolumne Storage 1,142,810 1,230,805 87,995 92.9% - Local System
Calaveras 55,142 96,670 41,528 57.0% -
San Antonio 43,084 53,266 10,182 80.9% -
Crystal Springs 41,307 68,953 27,646 59.9% -
San Andreas 16,025 18,675 2,650 85.8% -
Pilarcitos 1,815 3,125 1,310 58.1% -
Total Local Storage 157,373 240,689 83,316 65.4% -
Total System Storage 1,300,183 1,471,494 171,311 88.4% 84.0% Total without water bank 730,183 901,494 171,311 81.0% -
Other
California
Reservoirs
3 California Drought Monitor
4 Hetch Hetchy Precipitation
5 Upcountry 6-station Precipitation Index as of
August 30, 2026
12-Month Median Total: 30.92 inches
Current Year Total: 30.45 inches
6 Annual Comparison:
Bay Area 7-station Precipitation Index
as of August 30, 2026
12-Month Median Total: 23.35 inches
Current Year Total: 26.01 inches
7 Annual Comparison:
Upcountry Snowpack
8 Water Available to the City
9 10
California Precipitation Forecast
11 Upcountry Precipitation Forecast
Total Deliveries
12